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So I just finished reading an excellent biography on Emperor Napoleon and it has sort of inspired to begin planning a TL about a surviving Napoleonic Empire. I think the best way to accomplish this is for Napoleon to focus on the Peninsular War rather than invading Russia
I was wondering what the minor difference of having Tsar Paul I not being assassinated in 1801 and Napoleon not marrying Archduchess Marie Louise of Austria but rather marrying Archduchess Catherine of Russia would have had on the rest of the Napoleonic War